According to your answer, it looks like you could use some help with Percentages. We recommend starting with Volume 2 of the Learn Math Fast System. You'll learn how to solve percentages in your mind, plus a whole lot more.

Volumes 1 - 4

RESULTS: 4th Grade Level, however, the Learn Math Fast System is for all ages. Volume 2 covers 4th - 6th grade topics, but there is no mention of grade level within the books.

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Or read an article by JK Mergens on why some children struggle to learn multiplication.